Daylighting slat and daylighting device

Abstract

A daylighting slat ( 40 ) includes a daylighting plate ( 40 ) extending in one direction. The daylighting plate ( 40 ) includes: a transparent base material ( 41 ) having a curved or angled shape in a cross-section taken perpendicular to a lengthwise direction of the daylighting plate ( 40 ); a plurality of transparent daylighting sections ( 42 ) at least in a first region ( 41 Aa) of a first face ( 41 A) of the base material ( 41 ); and gap portions between the daylighting sections ( 42 ), wherein each of the daylighting sections ( 42 ) has a side face in contact with one of the gap portions, a part of the side face serving as a reflection face where light incident to that daylighting section ( 42 ) is reflected.

The invention claimed is: 
     
       1. A daylighting slat comprising a daylighting plane extending in one direction, the daylighting plane comprising:
 a base material that is transparent, the base material including a first region and a second region, the first region having an elongate and plate-like shape, the base material having a curved or angled shape in a cross-section taken perpendicular to a lengthwise direction of the daylighting plate, the first region adjoining the second region across a straight line parallel to the lengthwise direction; 
 a plurality of first daylighting sections that are transparent, the plurality of first daylighting sections being disposed on a first face of the first region, the plurality of first daylighting sections being not disposed on the second region; and 
 gap portions between the plurality of first daylighting sections,
 wherein each of the plurality of first daylighting sections has a side face in a contact with one of the gap portions, a part of the side face serving as a reflection face where light incident to the plurality of first daylighting sections is reflected. 
 
 
     
     
       2. The daylighting slat according to  claim 1 , wherein the plurality of first daylighting sections are disposed on the first face via a film. 
     
     
       3. The daylighting slat according to  claim 1 , the daylighting slat further comprising:
 a support member configured to support the daylighting plate. 
 
     
     
       4. The daylighting slat according to  claim 1 , the daylighting slat further comprising:
 a plurality of second daylighting sections, wherein 
 the plurality of second daylighting sections are disposed on the second region, and 
 a first daylighting function of the plurality of first daylighting sections is different from a second daylighting function of the plurality of second daylighting sections. 
 
     
     
       5. The daylighting slat according to  claim 4 , wherein the plurality of first daylighting sections have a different shape from that of the plurality of second daylighting sections, in respective cross-sections taken perpendicular to lengthwise directions thereof. 
     
     
       6. The daylighting slat according to  claim 1 , the daylighting slat further comprising:
 a light-diffusion layer on a second face of the first region. 
 
     
     
       7. The daylighting slat according to  claim 1 , wherein the base material is bent along a centerline thereof that is parallel to a lengthwise direction of the base material. 
     
     
       8. The daylighting slat according to  claim 1 , wherein:
 the base material is bent along the straight line and offset from a centerline of the base material; and 
 a first area of the first region is larger than a second area of the second region. 
 
     
     
       9. The daylighting slat according to  claim 1 , wherein the second region is light-absorbing. 
     
     
       10. The daylighting slat according to  claim 1 , wherein the second region is light-reflecting. 
     
     
       11. A daylighting device comprising:
 a plurality of slats; and 
 a support mechanism configured to connect the plurality of slats so that the plurality of slats have a lengthwise direction thereof in a horizontal direction and also to support the plurality of slats so that the plurality of slats hangs down in a vertical direction, 
 wherein at least one of the plurality of slats comprises the daylighting slat according to  claim 1 . 
 
     
     
       12. The daylighting slat according to  claim 11 , wherein the support mechanism is configured to support the plurality of slats so that the plurality of slats can move up and down. 
     
     
       13. The daylighting slat according to  claim 11 , wherein the support mechanism is configured to support the plurality of slats so that the plurality of slats can be tilted in a controlled manner. 
     
     
       14. The daylighting slat according to  claim 11 , wherein:
 at least one of those the plurality of slats which are in a vertically higher portion comprises the daylighting slat; and 
 at least another one of those the plurality of slats which are in a vertically lower portion comprises a shading slat. 
 
     
     
       15. The daylighting slat according to  claim 14 , wherein the daylighting slat has a shape identical to that of the shading slat, in response cross-sections taken perpendicular to the lengthwise directions thereof. 
     
     
       16. The daylighting slat according to  claim 11 , wherein:
 at least two of the plurality of slats each comprises the daylighting slat; and 
 in at least one of the daylighting slats, the plurality of first daylighting sections have different shapes.